The victim was on board the Princess Cruise Lines Grand Princess cruise liner. He disembarked the ship in San Francisco February 21, 2020, but 62 of his fellow-travelers continued--along with crew and hundreds of newly arrived passengers--aboard the Grand Princess on the next leg of its journey—to Hawaii.

After departing Hilo, the Grand Princess was diverted to its current position off of San Francisco after California authorities traced the victim back to the ship. The 62 travelers are quarantined within the ship.

HNN reports: “California Gov. Gavin Newsom says as many as 11 passengers and 10 crew members on the ship ― being held at sea off San Francisco ― are exhibiting flu-like symptoms.”

The LA Times reports: "Princess Cruises said it was notified by the CDC that it is investigating a small cluster of cases in Northern California among guests who sailed on the Grand Princess Mexican voyage."

CBS San Francisco, March 5, 2020: … The Grand Princess remained hovering off the California coast early Thursday (3-5-20), banned by Gov. Gavin Newsom from docking in San Francisco and any other California port until 21 passengers and crew members suffering from flu-like symptoms were tested for the coronavirus.

Cruise Tracker showed that by 4:30 a.m. the ship — carrying about 2,500 passengers — was moving up the California coast and was off Big Sur.

In a news release Wednesday night, Princess Cruises said the plan was for the U.S. Coast Guard to deliver sampling kits to the ship Thursday morning via helicopter. The onboard medical team would then administer the test with the samples being sent in batches by helicopter to a state testing lab in Richmond.

COVID-19 Test Kits being delivered to Grand Princess off San Francisco, March 5, 2020.

Cruise line officials placed the number of those who needed to be tested to fewer than 100.

“There are fewer than 100 guests and crew identified for testing, including all in-transit guests (guests who sailed the previous Mexico voyage and remained onboard for the current Hawaii voyage), those guests and crew who have experienced influenza-like illness symptoms on this voyage, and guests currently under care for respiratory illness,” the release read.

Newsom said that 11 passengers and 10 crew members have developed flu-like symptoms and needed to be tested before clearance to San Francisco — where the cruise to Hawaii began — or any other California port would be given.

…

A sick crew member was removed from the Grand Princess before it left Hawaii and returned to California.

“One crew member who had served on the February 11 voyage was medically disembarked from the Grand Princess in Hawaii (on the most recent voyage) with influenza like symptoms and has tested negative for COVID-19,” San Francisco health officials said….

AP March 6, 2020: … Twenty-one people aboard a mammoth cruise ship off the California coast tested positive for the new coronavirus, including 19 crew members, Vice President Mike Pence announced Friday, amid evidence the vessel was the breeding ground for a deadly cluster of at least 10 cases during its previous voyage.

Federal officials have been working with the state and “we have developed a plan to bring the ship to a non-commercial port,” Pence said. “All passengers and crew will be tested for the virus. Those that will need to be quarantined will be quarantined. Those who will require medical help will receive it.”

Princess Cruises said 45 of the more than 3,500 people on board were tested in the first round. A military helicopter crew lowered test kits onto the 951-foot (290-meter) Grand Princess by rope Thursday and later retrieved them for analysis as the vessel waited off San Francisco, under orders to keep its distance from shore.

Health officials trying to establish whether the virus is circulating on the Grand Princess undertook the testing after reporting that a passenger on a previous voyage of the ship, in February, died of the disease.

In the past few days, health authorities disclosed that at least nine other people who were on the same journey were also found to be infected. And some passengers on that trip stayed aboard for the current voyage….